Fixes diff with added files

src/commands/diffWith.ts

@@ -103,11 +103,15 @@ export class DiffWithCommand extends Command {
 					args.rhs.uri.fsPath,
 					args.rhs.sha,
 				);
-				if (status != null && status.status === 'D') {
+				if (status?.status === 'D') {
 					args.rhs.sha = GitRevision.deletedOrMissing;
 				} else {
 					rhsSha = args.rhs.sha;
 				}
+
+				if (status?.status === 'A' && args.lhs.sha.endsWith('^')) {
+					args.lhs.sha = GitRevision.deletedOrMissing;
+				}
 			}
 
 			const [lhs, rhs] = await Promise.all([

src/git/gitService.ts

@@ -3161,7 +3161,7 @@ export class GitService implements Disposable {
 				: Strings.normalizePath(paths.relative(repoPath, fileNameOrUri.fsPath));
 
 		const blob = await Git.rev_parse__verify(repoPath, ref, fileName);
-		if (blob == null) return ref;
+		if (blob == null) return GitRevision.deletedOrMissing;
 
 		return (await Git.log__find_object(repoPath, blob, ref)) ?? ref;
 	}